Therefore, learning PLC requires a certain foundation of electrotechnics, analog electronics and digital electronics, circuits and electrical components. Because there are many technical terms in the description of PLC itself, there is no relevant foundation, and you will be confused about related technical terms, programming methods, usage methods and signal forms, and it will be futile to learn, which will also have an impact on your learning confidence.
With the above foundation, learning PLC is divided into the following parts: 1, understanding PLC working mode, input and output, and wiring; 2. Learn PLC programming software; 3, understand the PLC programming methods and instructions; 4. Understand the control methods of common motors, frequency converters and variable frequency motors, stepping controllers and stepping motors, servo controllers and servo motors, and analog acquisition and control; 5, PLC system selection, including PLC itself, executive electrical components, etc. ; 6, understand the requirements of industrial field control, write a design specification; 7. Write PLC control flow chart; 8. Write programs; 9, on-site debugging
Many misunderstandings in learning are that PLC programming is very important and always walks into the alley of PLC programming. In fact, for the whole PLC industrial field control system, it is more important to write design instructions and control flow charts according to the requirements of field control. With the core idea of control flow chart, there will be a complete process program, and programming will be orderly and logical.